Zero Zone Reveal Merchandiser ORMC83D, Руководство по установке и эксплуатации, Страница: 16 / 21

14 • Refrigeration
REfRIgERATION REfRIgERATION
Mechanical Components
air is circulated through the display case by evaporator fans, which are located below the deck pans in the bottom of the case ( See Figure 19 ).
air is drawn through the front return air grill and discharged out of the honeycomb at the top.
The evaporator coil, located at the rear bottom of the case, can be inspected by removing the deck pans. Unless otherwise specified, the
thermostatic expansion valve (TXV) is mounted to the evaporator coil ( See Figure 20 ). Superheat should be adjusted to 6-10°F. Contact Zero
Zone for high-glide refrigerants.
Glycol cases typically have a balance valve located in the outlet line inside of the case. If a stop solenoid is provided, it will also be located in
the outlet line. Schrader valves are provided inside the case on the right-hand side of the coil for venting and draining the system.
Refrigerant Piping
Correct refrigeration line sizing and industry standard installation practices are essential for proper system operation ( See Figure 21 on page
15 ). after connections have been made, the refrigeration access hole in the case must be sealed completely with an aerosol-dispensed
urethane insulation or equivalent (example: Great Stuff ). Penetrations made in sheet metal baffles should also be sealed.
Operation Set Points
Refer to the case spec sheet for Btu/h requirements and electrical requirements. Operate the case at the proper settings to maintain correct
product temperature, per food safety regulations ( See Figure 22 on page 16 ). Note: Set points are based on flat shelves. Alternate
shelving—such as angled or tiered shelving, peg hooks, or produce inserts—may require lower operating temperatures.
FIGURE 19: Fans and
Case-to-Case Piping
FIGURE 20: Expansion Valve Next to Evaporator Coil